Tankless Water Heater 1.58 GPM Propane Instant Outdoor Heater

Our review of the Tankless Water Heater BE158B finds it best suited to campers, RV owners and small off-grid cabins that need a compact, propane-powered source of hot water. The main reason to buy is simple: it produces up to 1.58 GPM of hot water from a standard 20 lb propane tank with a powerful 41,000 BTU burner and an LED temperature readout, so you can get instant hot water outdoors without shore power. It is intentionally portable and easy to install, making it a practical choice when electric hookups are unavailable.

Key Features

• Instant hot water: Delivers up to 1.58 GPM so users get near-instant warm water for showers and washing without waiting for a tank to heat.
• High heat output: 41,000 BTU maximum output supports a significant temperature rise, useful for cold inlet conditions and quick recovery.
• Low pressure start: Starts at just 3.6 PSI of water pressure, allowing operation with low-flow or gravity-fed sources common in portable setups.
• Propane powered and portable: Runs on a standard 20 lb liquid propane tank and uses battery-powered electronic ignition so it works off-grid.
• Safety protections: Includes over-heating, low water flow, dry combustion, anti-freeze, high water pressure and flame failure protections for safer outdoor use.
• LED digital display: Bright temperature readout helps prevent scalding and makes it easier to dial in a comfortable shower temperature.

Who It's For

This unit is for outdoor enthusiasts who need a portable, propane-powered source of hot water: campers who want an instant shower, RV and boat owners needing a compact water heater, or anyone running a small cabin, greenhouse or barn without reliable electric service. It excels where portability, simple setup and propane fuel are priorities.

Those who should look elsewhere include households that require large, continuous hot water flow for multiple fixtures at once or consumers who need a permanently installed indoor water heater with full weatherproofing and warranty service from a traditional home appliance brand.

Pros & Cons

Pros

• Compact and portable design makes it easy to mount for outdoor showers and temporary installations.
• Strong 41,000 BTU output and up to 1.58 GPM flow provide useful hot water for showers and cleaning tasks.
• Multiple safety protections and CSA certification reduce risk during outdoor use.
• LED temperature display and simple battery ignition simplify operation without shore power.

Cons

• Some users report inconsistent temperature maintenance and occasional ignition or leakage issues, so expect to check fittings and monitor performance.
• Not fully weatherproof for prolonged exposure; requires dry storage and winter draining to avoid damage.

Specifications

Our Verdict

The BE158B is a sensible value for people who need a portable, propane instant water heater for outdoor showers, RVs or small off-grid spaces. Its high BTU output, low-start water pressure and safety features make it a practical tool, though buyers should be prepared to perform basic checks for ignition reliability and seals. For portable use and occasional outdoor duty it delivers useful hot water without needing electricity.

Frequently Asked Questions

Can this run from a standard 20 lb propane tank?
Yes, the unit is designed to run from a standard 20 lb liquid propane tank and ships with a pre-installed regulator and hose.

Does it require batteries or shore power?
No shore power is required; ignition is electronic and powered by two D-cell batteries so it operates off-grid.

Is it safe to use in cold weather?
It has anti-freeze and dry combustion protections, but the unit should be drained and stored in a warm, dry place for winter to prevent internal damage.